RAT5,
Gonzo is indeed correct in that only airfield fire service can cancel the full emergency. Also, the emergency services do not attend because they are bored. The emergency services are never bored, trust me. It is a locally agreed and pre-determined MAJAX plan that must be adhered to, the local hospitals are made aware, all part of the plan.
It was the bain of my life when I was a controller for the ambulance service twenty odd years ago. The airport on our patch required six ambulances to be sent for a full emergency. I rarely had six free to send to be honest.